/**
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2017 © yangxiaobing, 873559947@qq.com
 *
 * This file is part of contentManagerSystem.
 * contentManagerSystem is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * contentManagerSystem is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with contentManagerSystem.  If not, see <http://www.gnu.org/licenses/>.
 *
 * 这个文件是contentManagerSystem的一部分。
 * 您可以单独使用或分发这个文件，但请不要移除这个头部声明信息.
 * contentManagerSystem是一个自由软件，您可以自由分发、修改其中的源代码或者重新发布它，
 * 新的任何修改后的重新发布版必须同样在遵守GPL3或更后续的版本协议下发布.
 * 关于GPL协议的细则请参考COPYING文件，
 * 您可以在contentManagerSystem的相关目录中获得GPL协议的副本，
 * 如果没有找到，请连接到 http://www.gnu.org/licenses/ 查看。
 *
 * - Author: yangxiaobing
 * - Contact: 873559947@qq.com
 * - License: GNU Lesser General Public License (GPL)
 * - source code availability: http://git.oschina.net/yangxiaobing_175/contentManagerSystem
 */
package com.renshengjiwu.utils;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

/**
 * 生成验证码
 *
 * @author yangxiaobing
 * @date 2017/8/26
 *
 */
public class CreateImageCode {
  // 图片的宽度。
  private int width = 160;
  // 图片的高度。
  private int height = 40;
  // 验证码字符个数
  private int codeCount = 4;
  // 验证码干扰线数
  private int lineCount = 20;
  // 验证码
  private String code = null;
  // 验证码图片Buffer
  private BufferedImage buffImg = null;
  Random random = new Random();

  public CreateImageCode() {
    creatImage();
  }

  public CreateImageCode(int width, int height) {
    this.width = width;
    this.height = height;
    creatImage();
  }

  public CreateImageCode(int width, int height, int codeCount) {
    this.width = width;
    this.height = height;
    this.codeCount = codeCount;
    creatImage();
  }

  public CreateImageCode(int width, int height, int codeCount, int lineCount) {
    this.width = width;
    this.height = height;
    this.codeCount = codeCount;
    this.lineCount = lineCount;
    creatImage();
  }

  // 生成图片
  private void creatImage() {
    int fontWidth = width / codeCount;// 字体的宽度
    int fontHeight = height - 5;// 字体的高度
    int codeY = height - 8;

    // 图像buffer
    buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    Graphics g = buffImg.getGraphics();
    // Graphics2D g = buffImg.createGraphics();
    // 设置背景色
    g.setColor(getRandColor(200, 250));
    g.fillRect(0, 0, width, height);

    // 设置字体
    // Font font1 = getFont(fontHeight);
    Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
    g.setFont(font);

    // 设置干扰线
    for (int i = 0; i < lineCount; i++) {
      int xs = random.nextInt(width);
      int ys = random.nextInt(height);
      int xe = xs + random.nextInt(width);
      int ye = ys + random.nextInt(height);
      g.setColor(getRandColor(1, 255));
      g.drawLine(xs, ys, xe, ye);
    }

    // 添加噪点
    float yawpRate = 0.01f;// 噪声率
    int area = (int) (yawpRate * width * height);
    for (int i = 0; i < area; i++) {
      int x = random.nextInt(width);
      int y = random.nextInt(height);

      buffImg.setRGB(x, y, random.nextInt(255));
    }

    String str1 = randomStr(codeCount);// 得到随机字符
    this.code = str1;
    for (int i = 0; i < codeCount; i++) {
      String strRand = str1.substring(i, i + 1);
      g.setColor(getRandColor(1, 255));
      // g.drawString(a,x,y);
      // a为要画出来的东西，x和y表示要画的东西最左侧字符的基线位于此图形上下文坐标系的 (x, y) 位置处

      g.drawString(strRand, i * fontWidth + 3, codeY);
    }

  }

  // 得到随机字符
  private String randomStr(int n) {
    String str1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
    String str2 = "";
    int len = str1.length() - 1;
    double r;
    for (int i = 0; i < n; i++) {
      r = (Math.random()) * len;
      str2 = str2 + str1.charAt((int) r);
    }
    return str2;
  }

  // 得到随机颜色
  private Color getRandColor(int fc, int bc) {// 给定范围获得随机颜色
    if (fc > 255)
      fc = 255;
    if (bc > 255)
      bc = 255;
    int r = fc + random.nextInt(bc - fc);
    int g = fc + random.nextInt(bc - fc);
    int b = fc + random.nextInt(bc - fc);
    return new Color(r, g, b);
  }

  /**
   * 产生随机字体
   */
  private Font getFont(int size) {
    Random random = new Random();
    Font font[] = new Font[5];
    font[0] = new Font("Ravie", Font.PLAIN, size);
    font[1] = new Font("Antique Olive Compact", Font.PLAIN, size);
    font[2] = new Font("Fixedsys", Font.PLAIN, size);
    font[3] = new Font("Wide Latin", Font.PLAIN, size);
    font[4] = new Font("Gill Sans Ultra Bold", Font.PLAIN, size);
    return font[random.nextInt(5)];
  }

  // 扭曲方法
  private void shear(Graphics g, int w1, int h1, Color color) {
    shearX(g, w1, h1, color);
    shearY(g, w1, h1, color);
  }

  private void shearX(Graphics g, int w1, int h1, Color color) {

    int period = random.nextInt(2);

    boolean borderGap = true;
    int frames = 1;
    int phase = random.nextInt(2);

    for (int i = 0; i < h1; i++) {
      double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
      g.copyArea(0, i, w1, 1, (int) d, 0);
      if (borderGap) {
        g.setColor(color);
        g.drawLine((int) d, i, 0, i);
        g.drawLine((int) d + w1, i, w1, i);
      }
    }

  }

  private void shearY(Graphics g, int w1, int h1, Color color) {

    int period = random.nextInt(40) + 10; // 50;

    boolean borderGap = true;
    int frames = 20;
    int phase = 7;
    for (int i = 0; i < w1; i++) {
      double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
      g.copyArea(i, 0, 1, h1, 0, (int) d);
      if (borderGap) {
        g.setColor(color);
        g.drawLine(i, (int) d, i, 0);
        g.drawLine(i, (int) d + h1, i, h1);
      }

    }

  }

  public void write(OutputStream sos) throws IOException {
    ImageIO.write(buffImg, "png", sos);
    sos.close();
  }

  public BufferedImage getBuffImg() {
    return buffImg;
  }

  public String getCode() {
    return code.toLowerCase();
  }
}